A bird's slowdown problems

I have a 3GI bird that some days ago turns off in idle, I have disconnected the battery to reset the computer and sometimes the trick works. He also took it to the workshop and cleaned the injectors with ultra sound and worked for a while and returned to them, someone told me that it could be a sensor that regulates the passage of gasoline the truth I am lost and sometimes I do not believe much to the workshops of the concessionaire. I give up any help.

I appreciate any help

to Ramirez